Reciprocating compressor having an exhaust valve controlled by an electromagnet

Abstract

Disclosed is an exhaust valve capable of correctly opening/shutting an exhaust port of a cylinder based upon variation of the flux density of an electromagnet. The inventive exhaust valve may comprise a guide connected in parallel to an exhaust port of a cylinder, a needle valve provided inside the guide for opening/shutting the exhaust port while moving in cooperation with the guide. The needle valve may be controlled with an electromagnet. The invention enables complete opening of the exhaust port of the cylinder in exhaustion thereby preventing degradation of compression efficiency due to valve damage while reducing generation of vibration and noise.

What is claimed is:  
     
       1. An exhaust apparatus comprising: 
       a guide connected in parallel to an exhaust port of a cylinder;  
       a valve body provided inside said guide that opens/shuts said exhaust port while moving in cooperation with said guide; and  
       an electromagnet provided in the rear of said guide that controls said valve body,  
       wherein said valve body is permanent magnet.  
     
     
       2. The exhaust apparatus according to  claim 1 , wherein said valve body has a diameter larger than that of said exhaust port. 
     
     
       3. The exhaust apparatus according to  claim 1 , further comprising metallic materials having magnetism at both sides of said exhaust port that opens said exhaust port of said cylinder for a predetermined range. 
     
     
       4. The exhaust apparatus according to  claim 3 , wherein the electromagnet has a flux density larger than a critical flux density in the predetermined range. 
     
     
       5. The exhaust apparatus according to  claim 4 , wherein the critical flux density is determined from the attraction between said metallic materials and said valve body. 
     
     
       6. An exhaust apparatus comprising: 
       a guide connected in perpendicular to an exhaust port of a cylinder;  
       a valve body provided inside said guide that opens/shuts said exhaust port while moving in cooperation with said guide; and  
       an electromagnet provided in the rear of said guide that controls said valve body,  
       wherein said valve body is a permanent magnet.  
     
     
       7. The exhaust apparatus according to  claim 6 , wherein said electromagnet is provided in the rear of said guide. 
     
     
       8. A reciprocating compressor comprising: 
       a cylinder having a predetermined internal space;  
       a piston that linearly reciprocates inside said cylinder; and  
       an exhaust device that exhausts fluid which is compressed due to linear reciprocation of said piston according to opening/shutting device moving corresponding to the flux density of an electromagnet,  
       wherein said exhaust device comprises:  
       a guide connected in parallel or perpendicular to an exhaust port of said cylinder; and  
       said electromagnet provided in the rear of said guide that controls said opening/shutting device.  
     
     
       9. The reciprocating compressor according to  claim 8 , wherein said opening/shutting device is a permanent magnet. 
     
     
       10. The reciprocating compressor according to  claim 8 , further comprising an exhaust tube on one side of said guide that exhaust fluid when said guide is parallel to said exhaust port of said cylinder. 
     
     
       11. The reciprocating compressor according to  claim 8 , further comprising metallic materials having magnetism at both sides of said exhaust port of said cylinder for maintaining the attraction with said opening/shutting device when said guide is parallel to said exhaust port of said cylinder. 
     
     
       12. The reciprocating compressor according to  claim 8 , further comprising an exhaust tube parallel to said exhaust port of said cylinder when said guide is perpendicular to said exhaust port of said cylinder. 
     
     
       13. The reciprocating compressor according to  claim 8 , further comprising a metallic material having magnetism at one end of said guide that maintains the attraction with said opening/shutting device when said guide is perpendicular to said exhaust port of said cylinder. 
     
     
       14. The reciprocating compressor according to  claim 8 , wherein the flux density of said electromagnet is varied proportionally to the displacement of said piston. 
     
     
       15. The reciprocating compressor according to  claim 8 , wherein the flux density of said electromagnet takes place according to a current applied to said electromagnet. 
     
     
       16. The reciprocating compressor according to  claim 8 , wherein said exhaust port of said cylinder is opened while the flux density of said electromagnet exceeds a critical flux density. 
     
     
       17. The reciprocating compressor according to  claim 16 , wherein the critical flux density is determined from the attraction between said metallic material and said opening/shutting device. 
     
     
       18. An exhaust apparatus comprising: 
       a guide penetrating in parallel an exhaust port connected in parallel to an exhaust port of a cylinder;  
       a valve body provided inside said guide that opens/shuts said exhaust port while moving in cooperation with said guide; and  
       an electromagnet provided in the rear of said guide that controls said valve body,  
       wherein said valve body is a permanent magnet.  
     
     
       19. The exhaust apparatus according to  claim 18 , further comprising a metallic material having megnetism in the front of said guide that maintains the attraction with said valve body. 
     
     
       20. The exhaust apparatus according to  claim 19 , wherein a critical flux density is determined from the attraction between said metallic material and said valve body. 
     
     
       21. The exhaust apparatus according to  claim 18 , wherein said exhaust port of said cylinder is opened while a flux density generated from said electromagnet exceeds a critical flux density.